Nuclear winter - WikipediaNuclear winter is the severe and prolonged global climatic cooling effect hypothesized to occur after widespread firestorms following a nuclear war The hypothesis is based on the fact that such fires can inject soot into the stratosphere, where it can block some direct sunlight from reaching the surface of the Earth It is speculated that the resulting cooling would lead to widespread crop

Nuclear weapon - WikipediaA nuclear weapon is an explosive device that derives its destructive force from nuclear reactions, either fission (fission bomb) or from a combination of fission and fusion reactions (thermonuclear bomb) Both bomb types release large quantities of energy from relatively small amounts of matter The first test of a fission ("atomic") bomb released an amount of energy approximately equal to